There is only one File menu in Line Bead page, which includes Save, Save As, Import, Export, Clear and Exit.
SAVE – Save the current database. The program will save the current database to the local file.
SAVE AS– Save as the current database. The program will save the current database as a new data file.
IMPORT – Import the drawbead setting existing in database. The format of the import file is *.drb.
EXPORT – Export the currently defined drawbead setting. The format of the export file is *.drb.
CLEAR – Clear the current setting. The system will pop up a confirmation dialog box before clearing.
EXIT – Exit Drawbead dialog box and return to eta/DYNAFORM main interface.
The Line Bead dialog box is illustrated in Figure 11.4.1
Figure 11.4.1 Define Line Bead dialog box
After entering the Define Line Bead page, click Add button to create drawbead. This button is automatically enabled during the first entry.
1. DRAWBEAD NAME
This function allows the user to define the name of drawbead. The default drawbead name is DRWBD, which is not allowed to change.
2. DEFAULT PROPERTY
This function allows the user to define drawbead property. When defining drawbead the first time, the user can only select USE DEFAULT PROPERTY illustrated in Figure 11.4.2. When defining drawbead afterwards, the user is allowed to select the existing drawbead property as the new drawbead property, as illustrated in Figure 11.4.3. The drawbead property can be modified after the drawbead is defined.
Figure 11.4.2 Use default property
Figure 11.4.3 Use property of drawbead
3. DRAWBEAD LINE
This function allows the user to create drawbead line through the following three methods. The first method is to select the existing geometric line. Click this button to display the Select Line dialog box illustrated in Figure 11.4.4 for the user to select one or multiple lines as drawbead line. The second is to import drawbead line. Click this button to display the dialog box illustrated in Figure 11.4.5 where there are two types of file named *.cur and *.igs. The third is to create drawbead line, including Spline and Piecewise. Click this button to display the Create Line dialog box illustrated in Figure 11.4.6. The user can create line through four methods: Node, Point, Cursor on Element and Cursor on Surface. Below the above three defining methods, the number and defining method for the defined drawbead line will display, as illustrated in Figure 11.4.7.
Figure 11.4.4 Select line dialog box
Figure 11.4.5 Import line dialog box
Figure 11.4.6 Create line dialog box
Figure 11.4.7 Drawbead line information
4. MESH PARAMETERS
The program provides three methods to define the density of points on line, as illustrated in Figure 11.4.8.
Figure 11.4.8 Define point on drawbead line
l BY DISTANCE
Set the density of points by assigning the distance between adjacent points on line. The default distance is 15.
l UNIFORM
All the assigned points are uniformly arranged on each line, the default value is 15.
l CHORDAL DEVIATION
The points on line are distributed according to the chordal deviation. The greater the curvature of line is and the more the distributed points are, the smaller the chordal deviation is, which means the more points can be created on line. Figure 11.4.9 shows the difference between UNFORM and CHORDAL DEVIATION. The default chordal deviation is 0.25.
a) Uniform b) Chordal deviation
Figure 11.4.9 Density of points on line
5. DRAWBEAD LIST
After finishing the definition, click Apply button to create drawbead on the defined line. Different lines belong to different drawbeads. The program will assign different ID number for each drawbead, such as Drwbd1 and Drwbed2. The corresponding ID number will display beside the drawbead, as illustrated in Figure 11.4.10.
Figure 11.4.10 Name drawbead
All the defined drawbeads and their force percentages are shown in the drawbead list, as illustrated in Figure 11.4.11. Each new drawbead will be added to the list automatically. The user can press SHIFT or CTRL button to select multiple drawbeads from the list and all the selected drawbeads will be highlighted in the graphic display window. The user can toggle on LIST BY PROPERTY to show the property of each drawbead, as illustrated in Figure 11.4.12. Click BACK button in Figure 11.4.1 to exit Create Drawbead page.
Figure 11.4.11 Drawbead list
Figure 11.4.12 Drawbead property lis
Once the drawbead is defined, this button is enabled, as illustrated in Figure 11.4.13.
Figure 11.4.13 Delete drawbead
This function allows the user to delete the selected drawbeads. The user selects drawbeads in the drawbead list and click DELETE button to delete all the selected ones. If the user does not select any drawbead and click DELETE button directly, the program will pop up a dialog box for the user to select drawbead to be deleted through screen selection method. After selection, click the middle mouse button to confirm or the right mouse button to exit screen selection without deleting the selected drawbeads.
Once the drawbead is defined, this button is enabled, as illustrated in Figure 11.4.13. Click this button to enable the Operation button illustrated in Figure 11.4.14. The Modify Operations includes: RESPACE, EDIT, SPLIT, TRIM, COMBINE and EXTEND.
Figure 11.4.14 Modify drawbead
l RESPACE
This function allows the user to respace points on the drawbead. Click this button to display RESPACE dialog box illustrated in Figure 11.4.15. Select a method to define and click APPLY to confirm. Since screen selection is supported for this operation, the user can use screen selection to operate different drawbeads continuously. The ID number of the currently edited drawbead is shown in this dialog box.
Figure 11.4.15 Respace dialog box
l EDIT
This function allows the user to edit drawbead. The program will pop up a Curve Edit dialog box for the user to edit drawbead with appropriate functions. Refer to Section 5.1.15 for detailed description about operation. If the user selects drawbead in the drawbead list, click EDIT button so that the selected drawbead will be edited. If the user does not select drawbead in the list, the program will pop up a dialog box for the user to select a drawbead to be edited through screen selection method.
l SPLIT
This function allows the user to split drawbead. Click this button,the Select Split Point dialog box will be displayed. The user clicks the left mouse button on screen to select a position. Then the program will find the nearest node to the selected position and split this drawbead. The original drawbead is divided into two drawbeads with the same property that is also same as the one of the original drawbead, as illustrated in Figure 11.4.16. This operation can be performed on different drawbeads continuously.
(a) Before split (b) After split
Figure 11.4.16 Split drawbead
l TRIM
This function allows the user to trim drawbead line. The user selects a trim position first on the drawbead to be trimmed and then selects another node as the trim direction. If a node on the left side of the trim position is selected, the left part of drawbead will be trimmed; if a node on the right side of the trim position is selected, the right part of drawbead will be trimmed. This operation can be performed on different drawbeads continuously.
l COMBINE
This function allows the user to combine the two adjacent drawbeads.
1. Click the left mouse button in the display area to select a drawbead.
2. Select another drawbead which is adjacent to the selected one, as illustrated in Figure 11.4.17. The program will combine these two drawbead.
Only one combine operation can be performed by clicking this button.
(a) Before combine (b) After combine
Figure 11.4.17 Combine drawbead
NOTE: This function allows the user to combine two adjacent drawbeads with different properties. If the two adjacent drawbeads have the same property, the combined drawbead will have the same property with them. If the two drawbeads have different properties, the combined drawbead will have the same property with the first selected drawbead.
l EXTEND
This function allows the user to extend the selected drawbead. Click this button to display a dialog box illustrated in Figure 11.4.18. The user clicks the left mouse button on screen area to select a drawbead to be extended. The program will select the end point which is near the selected position as the extend point. Only one extend operation will be performed by clicking the left button.
Figure 11.4.18 Extend Bead
DISTANCE: Define the extending distance. The maximum value is 100.
CURRENT: Show the ID number of the current selected drawbead.
The Line Bead interface after drawbead definition is illustrated in Figure 11.4.19.
Figure 11.4.19 Line bead dialog box
The user can define drawbead property, drawbead force and force coefficient, and lock tool to the specified part.
1. CURRENT
Show the name and ID number of the current selected drawbead.
2. REFERRENCE
This option enables the user to define or modify drawbead property and show if the drawbead has corresponding reference line.
a) PROPERTY
The PROPID=1 button behind PROPERTY indicates the property of the current drawbead. The user may click this button to modify drawbead property, as illustrated in Figure Figure 11.4.20.
Figure 11.4.20 Drawbead Property dialog box
Figure 11.4.21 Property parameters dialog box
All the existing properties are listed in this list.
l NEW
This function enables the user to create property. Click this button to display DRAWBEAD PROPERTY dialog box illustrated in Figure 11.4.21.
PROPERTY NAME
Set property name. The default name is PROPERTY.
STATIC FRICTION COEF.
Set static friction coefficient between blank and drawbead. The default is 0.1.
DYNAMIC FRICTION COEF.
Set dynamic friction coefficient between blank and drawbead. The default is 0, which means the dynamic friction coefficient between blank and drawbead can be neglected.
BENDING CURVE SCALE
Set bending curve scale of the bending curve. The default is 1.0.
DRAWBEAD DEPTH
Define the depth of drawbead. The default is 1.0.
l MODIFY
This function enables the user to edit the current property. Click this button to display the dialog box illustrated in Figure 11.4.21 for the user to modify the parameters.
l DELETE
This function enables the user to delete the selected properties.
NOTE: The current property can only be deleted when it is not assigned to any drawbead. Otherwise, the program will prompt:
This item can not be deleted, because it is referred by drawbead.
b) REFER TO
This function is used to show if the current drawbead has referenced line. Show the ID number if there is referenced line; show NONE if there is not any referenced line. If there is reference relation between drawbead and line, when modifying the shape and position of line, the drawbead will change accordingly. Click this button to delete this reference relation. The program will pop up a confirmation dialog box illustrated in Figure 11.4.22. Click Yes to delete and No not to delete.
Figure 11.4.22 Confirmation dialog box
NOTE: During the line operation, the ID number of a line cannot be changed. Otherwise, the reference relation will be deleted automatically. The changing and extending operations of a line will not change the ID number. Operations such as edit and modify will change the line ID number.
3. LOCK FORCE
This function is used to define the drawbead force. As shown in the interface in Figure 11.4.23, the user can select multiple drawbeads to define simultaneously.
Figure 11.4.23 Lock force dialog box
a) TYPE
This option is used to select the type to define drawbead force. The program provides three types: INPUT, CALCULATE and DEFINE.
b) FORCE
This option is used to define the full lock force. The default is a empirical value calculated according to the blank thickness and material. The user may input this value. Clicking DEFAULT button, the program will calculate the default full lock force according to blank information.
c) PER%
This option is used to define the force coefficient of drawbead. Input a percentage in the input box. The current drawbead force is obtained via multiplying full lock force by this percentage.
The detailed description of the three types is as follows:
l INPUT: Define full lock force by input, which is the default type. The user can define in the FORCE input box or click DEFAULT button to calculate through program.
l CALCULATE: Calculate full lock force according to the drawbead profile shape. The interface illustrated in Figure 11.4.24 appears once this type is selected. Click CALCULATE… button to display Drawbead force and geometry dialog box illustrated in Figure 11.4.25.
Figure 11.4.24 Calculate force dialog box
Figure 11.4.25 Drawbead force and geometry dialog box
GEOMETRY
The program provides two drawbead profile shape: rectangle drawbead and hemicycle drawbead. The user adjust the drawbead profile shape by inputting control parameters, or edit by dragging the mouse cursor in graphic area. The control parameters of rectangle drawbead is illustrated in Figure 11.4.26.
Figure 11.4.26 Rectangle drawbead profile dialog box
R1: exit radius of drawbead. Range: 0.5t~1000mm.
R2: entrance radius of drawbead. Range: 0.5t~1000mm.
R3: exit radius of drawbead groove. Range: 0.5t~1000mm.
R4: entrance radius of drawbead groove. Range: 0.5t~1000mm.
H1: drawbead height. Range: 0~1000mm.
W1: drawbead width. Range: t~1000mm
CL: clearance of drawbead groove. Range: 0~100mm.
TH: blank thickness. This value is obtained from the blank parameter and is not allowed to change.
W2: width of drawbead groove. W2=W1+2TH+2CL
H2: height of drawbead groove. H2=H1+2
The arrow in the above figure indicates the flowing direction of material.
The control parameters of hemicycle drawbead is illustrated in Figure 11.4.27.
Figure 11.4.27 Hemicycle drawbead profile dialog box
R1, R2: drawbead radius. The user can edit by dragging mouse cursor but is not allowed to input directly for edit. The user can control it precisely via W1.
R3: exit radius of drawbead groove. Range: 0.5t~1000mm.
R4: entrance radius of drawbead groove. Range: 0.5t~1000mm.
H1: drawbead height. Range: 0~1000mm.
W1: drawbead width. Range: t~1000mm
CL: clearance of drawbead groove. Range: 0~100mm.
TH: blank thickness. This value is obtained from the blank parameter and is not allowed to change.
W2: width of drawbead groove. W2=W1+2TH+2CL
H2: height of drawbead groove. H2=H1+2
NOTE: The user can translate and scale the profile shape in graph using the middle mouse cursor. Double click the middle mouse button in graph area to show the control point of profile shape. Double click the left mouse button to show the maximum size of profile in graph area.
FORCE
This function is used to display the force values corresponding to the above mentioned drawbead profile shape. There are two display methods: FORCE FACTOR and FORCE VALUE. FORCE FACTOR is the ratio of drawbead force and yield stress of the current material (dimensionless). FORCE VALUE is the force (N/mm) generated from the current profile shape. The default is FORCE VALUE, as illustrated in Figure 11.4.28.
Figure 11.4.28 Force dialog box
RESTRAINING: show the restraining force generated from the current profile. If Force Value is selected, show the force value. If Force Factor is selected, show the ratio of drawbead force and yield stress of material, as illustrated in Figure 11.4.29.
Figure 11.4.29 Force factor dialog box
VARIABLE: the parameters to control drawbead force. If this parameters are changed, the drawbead force will change accordingly. For drawbeads with different profiles, the control parameters are always R1, R2, R3, R4, H1, W1 and CL.
The relationship between force value or force factor and variable is shown in the right side of graphic display area. The user can change the variable (the current variable is H1) by moving the dotted line in graph using the left mouse cursor. The corresponding force will change accordingly. This control parameter will also change accordingly in the geometry area.
PROCESS PARAMETER
This function is used to define the friction between blank and drawbead. The drawbead force will change according if this value changes. As illustrated in Figure 11.4.30, only show the blank material information which is not allowed to be changed.
Figure 11.4.30 Process Parameter dialog box
After completion of definition, the FORCE input field will show the drawbead force corresponding to the current profile and the PER value 100%, as illustrated in Figure 11.4.31. These two values are not allowed to be changed manually.
Figure 11.4.31 Lock Force dialog box
l DEFINE: Define drawbead force by defining force curve. As illustrated in Figure 11.4.32, click DEFINE button to display the dialog box illustrated in Figure 11.4.33. The user may define force curve.
Figure 11.4.32 Define force
Figure 11.4.33 Define curve dialog box
4. LOCK TOOL
The function enables the user to specify drawbead and lock it to a part along the stamping direction or working direction of the part, as illustrated in Figure 11.4.34.
Figure 11.4.34 Lock tool dialog box
The user may select a drawbead first and click SELECT button to display Select Part dialog box illustrated in Figure 11.4.35. The user selects a target part to which the drawbead will be locked.
Figure 11.4.35 Select Part dialog box
Figure 11.4.36 Lock tool dialog box
REMOVE: Remove the lock property of drawbead, which means the drawbead is not locked to any part. Click this button to display the dialog box illustrated in Figure 11.4.37 to query whether to remove locked part.
Figure 11.4.37 Warning dialog box
Figure 11.4.38 Before locking drawbead
Figure 11.4.39 After locking drawbead
NOTE: If drawbeads are generated via the menu Setup/AutoSetup/Tools/Drawbeads, it is projected onto the target part along its WORKING DIRECTION.
The user may select the following options to show drawbeads and define the drawbead box size, as shown in Figure 11.4.40.
Figure 11.4.40 Show options interface
1. DRAWBEAD
This function enables the user to show all the drawbeads in the display area of screen. This option is toggled on by default.
2. LOCK FORCE PERCENTAGE
This function enables the user to control the display of lock force percentage in graphic area. This option is toggled on by default.
3. COLOR BY PROPERTY
This function enables the user to show drawbeads with the color of drawbead property. Drawbeads with different properties have different colors. This option is not toggled on by default, which means drawbead colors corresponding to different curves are different.
4. SHOW NODES
This function enables the user to show all the nodes on drawbead in the display area of screen. This option is toggled on by default.
5. DEFINE BOX SIZE
This function enables the user to define a box with special shape around drawbeads. This box can contain the drawbead nodes and outer edge of flange, which can be used to restrain the main surface size contacted by drawbead. The box size, with a default value of 200, is the shortest distance between drawbead and box surface. The user may define the box size and press ENTER button or move the focus aside to update data.
NOTE: It is strongly suggested to reduce the main (blank) surface size when defning drawbead box, which can greatly save cost and memory.
6. SHOW BOX
This function enables the user to show drawbead box in the display area of screen, as illustrated in Figure 11.4.41.
Figure 11.4.41 Show box